#34 Adding concerned method to reported diagnostic in case a mapping is ambiguous

processor/src/main/java/org/mapstruct/ap/processor/MapperCreationProcessor.java

@@ -26,6 +26,7 @@ import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+
 import javax.annotation.processing.Messager;
 import javax.lang.model.element.Element;
 import javax.lang.model.element.ExecutableElement;
@@ -242,7 +243,7 @@ public class MapperCreationProcessor implements ModelElementProcessor<List<Metho
                         messager.printMessage(
                             Kind.ERROR,
                             String.format(
-                                "Ambigious factory methods: \"%s\" conflicts with \"%s\".",
+                                "Ambiguous factory methods: \"%s\" conflicts with \"%s\".",
                                 result,
                                 method
                             ),
@@ -557,6 +558,8 @@ public class MapperCreationProcessor implements ModelElementProcessor<List<Metho
         }
 
         MethodReference propertyMappingMethod = getMappingMethodReference(
+            method,
+            "property '" + Executables.getPropertyName( sourceAccessor ) + "'",
             mapperReferences,
             methods,
             sourceType,
@@ -605,7 +608,14 @@ public class MapperCreationProcessor implements ModelElementProcessor<List<Metho
         );
 
         MethodReference elementMappingMethod =
-            getMappingMethodReference( mapperReferences, methods, sourceElementType, targetElementType );
+            getMappingMethodReference(
+                method,
+                "collection element",
+                mapperReferences,
+                methods,
+                sourceElementType,
+                targetElementType
+            );
 
         if ( !sourceElementType.isAssignableTo( targetElementType ) && conversion == null &&
             elementMappingMethod == null ) {
@@ -651,12 +661,16 @@ public class MapperCreationProcessor implements ModelElementProcessor<List<Metho
         );
 
         MethodReference keyMappingMethod = getMappingMethodReference(
+            method,
+            "map key",
             mapperReferences,
             methods,
             sourceKeyType,
             targetKeyType
         );
         MethodReference valueMappingMethod = getMappingMethodReference(
+            method,
+            "map value",
             mapperReferences,
             methods,
             sourceValueType,
@@ -708,7 +722,8 @@ public class MapperCreationProcessor implements ModelElementProcessor<List<Metho
         );
     }
 
-    private MethodReference getMappingMethodReference(List<MapperReference> mapperReferences,
+    private MethodReference getMappingMethodReference(Method mappingMethod, String mappedElement,
+                                                      List<MapperReference> mapperReferences,
                                                       Iterable<Method> methods, Type parameterType,
                                                       Type returnType) {
         List<Method> candidatesWithMathingTargetType = new ArrayList<Method>();
@@ -750,11 +765,12 @@ public class MapperCreationProcessor implements ModelElementProcessor<List<Metho
             messager.printMessage(
                 Kind.ERROR,
                 String.format(
-                    "Ambiguous mapping methods found for mapping from %s to %s: %s.",
+                    "Ambiguous mapping methods found for mapping " + mappedElement + " from %s to %s: %s.",
                     parameterType,
                     returnType,
-                    candidatesWithBestMatchingSourceType
+                    Strings.join( candidatesWithBestMatchingSourceType, ", " )
-                )
+                ),
+                mappingMethod.getExecutable()
             );
         }
 

processor/src/test/java/org/mapstruct/ap/test/erroneous/ambiguousfactorymethod/FactoryTest.java

@@ -37,7 +37,6 @@ import org.testng.annotations.Test;
 })
 public class FactoryTest extends MapperTestBase {
 
-
     @Test
     @IssueKey("81")
     @ExpectedCompilationOutcome(
@@ -46,7 +45,7 @@ public class FactoryTest extends MapperTestBase {
             @Diagnostic(type = BarFactory.class,
                 kind = javax.tools.Diagnostic.Kind.ERROR,
                 line = 29,
-                messageRegExp = "^Ambigious factory methods: \"org\\.mapstruct\\.ap\\.test\\.erroneous\\."
+                messageRegExp = "^Ambiguous factory methods: \"org\\.mapstruct\\.ap\\.test\\.erroneous\\."
                     + "ambiguousfactorymethod\\.Bar createBar\\(\\)\" conflicts with "
                     + "\"org\\.mapstruct\\.ap\\.test\\.erroneous\\.ambiguousfactorymethod\\.Bar "
                     + "org\\.mapstruct\\.ap\\.test\\.erroneous\\.ambiguousfactorymethod"

processor/src/test/java/org/mapstruct/ap/test/inheritance/complex/ComplexInheritanceTest.java

@@ -18,10 +18,7 @@
  */
 package org.mapstruct.ap.test.inheritance.complex;
 
-import static org.fest.assertions.Assertions.assertThat;
-
 import java.util.Arrays;
-
 import javax.tools.Diagnostic.Kind;
 
 import org.mapstruct.ap.testutil.IssueKey;
@@ -32,6 +29,8 @@ import org.mapstruct.ap.testutil.compilation.annotation.Diagnostic;
 import org.mapstruct.ap.testutil.compilation.annotation.ExpectedCompilationOutcome;
 import org.testng.annotations.Test;
 
+import static org.fest.assertions.Assertions.assertThat;
+
 /**
  * Test for propagation of attributes inherited from super types.
  *
@@ -78,9 +77,12 @@ public class ComplexInheritanceTest extends MapperTestBase {
     @ExpectedCompilationOutcome(value = CompilationResult.FAILED,
         diagnostics = @Diagnostic(
             kind = Kind.ERROR,
-            messageRegExp = "Ambiguous mapping methods found for mapping from .*SourceExt to .*Reference: \\["
+            type = ErroneousSourceCompositeTargetCompositeMapper.class,
+            line = 32,
+            messageRegExp =
+                "Ambiguous mapping methods found for mapping property 'prop1' from .*SourceExt to .*Reference: "
                     + ".*Reference .*AdditionalMappingHelper\\.asReference\\(.*SourceBase source\\), "
-                + ".*Reference .*AdditionalMappingHelper\\.asReference\\(.*AdditionalFooSource source\\)\\]"))
+                    + ".*Reference .*AdditionalMappingHelper\\.asReference\\(.*AdditionalFooSource source\\)"))
     public void ambiguousMappingMethodsReportError() {
     }